Arteries are the blood vessels that carry oxygen-rich blood from the heart to the body's tissues. Arteries are often referred to as "the pipes" of the circulatory system.

There are three main types of arteries in the human body: pulmonary arteries, systemic arteries, and coronary arteries.

Pulmonary arteries carry oxygen-poor blood from the heart to the lungs, where it is oxygenated. Systemic arteries carry oxygen-rich blood from the heart to the rest of the body. Coronary arteries are the vessels that supply oxygen-rich blood to the heart muscle itself.

Arteries are composed of three layers: an inner layer of smooth muscle, a middle layer of elastic tissue, and an outer layer of connective tissue.

The smooth muscle layer is responsible for the contraction and relaxation of the artery, which regulates blood flow. The elastic tissue layer allows the artery to expand and recoil with each heartbeat. The connective tissue layer provides structural support to the artery.

Arteries are essential to the proper functioning of the circulatory system. Without them, blood would not be able to reach the body's tissues and organs.